AI Article Synopsis
- * Previous studies indicated that inflammation in mice led to an increase in satellite glial cell (SGC) activation and altered sensitivity in the dorsal root ganglia (DRG) after lipopolysaccharide (LPS) injection.
- * The current study found that exercise, such as free wheel running, not only prevented increased sensitivity to touch but also reversed harmful changes in the DRG caused by inflammation, which may contribute to the pain-relieving effects of exercise.
Article Abstract
Emerging research indicates that physical activity can ameliorate chronic pain, but the underlying mechanisms are still largely obscure. In particular, little is known on the mechanisms behind exercise-induced analgesia in the setting of inflammatory pain. In our previous studies on systemic inflammation in mice using lipopolysaccharide (LPS) administration, we characterized satellite glial cells (SGCs) and neurons in dorsal root ganglia (DRG). We found that a week post-LPS injection, the sensitivity to mechanical stimulation was lowered, SGCs were activated and coupling among SGCs increased 3 to 4.5-fold. In the present work, we examined the effects of exercise (free wheel running) on tactile sensitivity and on pathological changes in mouse DRG in the LPS model. We found that exercise prevented tactile hypersensitivity, and also reversed the cellular changes in the DRG induced by LPS that were listed above. We propose that the analgesic effect of exercise is at least partly mediated by reversing the pathological changes in SGCs.
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| http://dx.doi.org/10.1016/j.neulet.2022.136616 | DOI Listing |
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